Question: What is governed by the Warsaw Pact effective from 12th March 1967?
Paraphrase: Effective as of the 12th of March, 1967, what does the Warsaw pact govern?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q41644 p:P4791 ?s . ?s ps:P4791 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1967')) }